EP0998164A1 - Vorrichtung und Verfahren zur Überwachung des Paketenverlustes in einem Kommunikationssystem - Google Patents

Vorrichtung und Verfahren zur Überwachung des Paketenverlustes in einem Kommunikationssystem Download PDF

Info

Publication number
EP0998164A1
EP0998164A1 EP99402420A EP99402420A EP0998164A1 EP 0998164 A1 EP0998164 A1 EP 0998164A1 EP 99402420 A EP99402420 A EP 99402420A EP 99402420 A EP99402420 A EP 99402420A EP 0998164 A1 EP0998164 A1 EP 0998164A1
Authority
EP
European Patent Office
Prior art keywords
packet
signaling
packets
node
loss
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99402420A
Other languages
English (en)
French (fr)
Other versions
EP0998164B1 (de
Inventor
Michel Henrion
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel CIT SA
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Publication of EP0998164A1 publication Critical patent/EP0998164A1/de
Application granted granted Critical
Publication of EP0998164B1 publication Critical patent/EP0998164B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5625—Operations, administration and maintenance [OAM]
    • H04L2012/5627—Fault tolerance and recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5647—Cell loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly

Definitions

  • the present invention relates to a method and a device for monitoring packet losses in an asynchronous communication system.
  • information is in the form of blocks either of fixed length, such as ATM cells, or of length variable, such as packets.
  • packet will be used to designate any type of data block.
  • Each data block includes, on the one hand, the information itself and, on the other hand, information attached routing, called header, to transfer information to their final destination.
  • Such rare, or low probability, loss of information can be of two different types.
  • the first type of loss occurs during normal operation. Indeed, a network has an admissible rate of information loss, which is typically at most of the order of 10 -10 .
  • Such losses in normal operation originate, for example, a temporary congestion or saturation of a buffer memory through which the packets pass.
  • the second type of rare loss, or low probability corresponds to certain types of operating failure of a particular network device producing transient faults which are difficult to detect.
  • transient faults are caused, for example, by marginal operation due to poor contact or unstable voltage; they can also appear for certain specific data or address codes, or even for certain bits or lines of memory.
  • transient faults can cause relatively low loss rates, such as 10 -8 . Although intrinsically low, such a loss rate is not admissible since it exceeds by a factor of 100 the maximum admissible rate.
  • conventional methods are based, for example, on a count of incoming packets that are compared to counting outgoing packets, or detecting packet losses in each module.
  • the first one technique is called "end-to-end monitoring" between a terminal module input and an output terminal module.
  • the second technique is surveillance or within each module, that is to say in each input module, in each output module and in each switching element.
  • a protocol for monitoring between modules makes it possible to compare the number of packets received at the port the number of packets transmitted to the input port. For example, we assign a marking with each Nth packet transmitted to the input port and, at the output port, we checks that N packets are received between two consecutive markings.
  • Another similar type of monitoring method involves assigning a serial number sequential to packets and to check that the order of received packets corresponds to the order transmitted packets. In addition to detecting packet loss, you can also use a CRC code (cyclic redundancy code) or a parity bit to check the integrity packets transferred.
  • CRC code cyclic redundancy code
  • the observations are performed in each of the modules of a node where packets can be lost.
  • the flaws being observed only locally, it cannot be determined whether the origin of the fault is found in the module concerned or if the package was already defective when entry in this module. Determining the packet loss rate then requires additional measurements per connection in all modules.
  • This technique is generally not used to measure packet loss rates "end to end" due to the difficulties of synchronization between modules.
  • the invention overcomes the drawbacks of the two known techniques.
  • the method according to the invention is characterized in that, for monitoring packet losses in a packet transport network in asynchronous transfer, when a packet loss is detected in at least one module or switching element of a network node, we generate, for each lost packet, a so-called packet loss signaling packet, and routes this signaling packet using the same routing data than those of the lost package.
  • the method according to the invention is usable in most packet loss situations. In fact, in the majority cases (including data congestion), routing data remain intact.
  • the packet signaling loss of package contains information representing the identity of the module or element where it was created.
  • the packet signaling packet loss also includes information representing the cause of the fault, in particular for distinguish between a loss due to traffic congestion, and a loss due to a default.
  • the method according to the invention applies both to switching nodes single-path only to multi-path switching nodes.
  • single-path it is understood that the routing of packets of a given connection cannot take place only along a single predetermined path through a switching node.
  • multi-path it is meant that the routing of each of the packets of a given connection can be performed dynamically according to a multiplicity possible paths through a switching node.
  • the routing data of the packet loss signaling packet include the identity of the connection individual on the predetermined path.
  • the routing data of the packet loss signaling packet include only one address explicit or implicit (for example the identity of a dissemination tree) of the destination port (s) of exit; in this case, the identity of the individual connection is incorporated in the data part of the signaling packet.
  • the packet loss signaling packet preferably has a length smaller than that of the lost packet so as to limit the amount of data transmitted for this type of signaling.
  • networks where transported data packets have a fixed length e.g. networks of ATM cells
  • the signaling packet comprises, first of all, a header comprising, on the one hand, an indicator representing its identity of signaling packet of packet loss, and, on the other hand, routing data which, as noted above, are the same as those of the lost package.
  • the packet loss signaling packet then includes data proper which include the identifier of the individual connection, in the case of multi-path switching.
  • This data may also include data representing the type of loss and / or the identities of the module and the node where the package was lost.
  • This indicator distinguishes between losses of local packet in the node and losses from one or more other nodes upstream network.
  • the invention is not limited to a monitoring method in a network of transport of packages. It also relates to the processing of each packet of signaling packet loss in modules or switching elements in each node of this network to allow the implementation of this monitoring packet loss.
  • the invention also relates to the signaling packet as such.
  • the output terminal module is arranged either to transmit outside of this node, for example on the connection to the next node, the packet loss signaling packets it has received as well as those that he eventually generated himself, either to eliminate the packet loss signaling packets received, cumulative monitoring does not then taking place not downstream beyond this output terminal module.
  • observation or monitoring of the packet loss rate can be carried out either through a single node, or cumulatively over a section of connection comprising several switching nodes. It is also possible perform local observation at each node and observation simultaneously accumulated on several nodes.
  • the signaling pack includes in its header, an indicator signaling its nature as a loss signaling packet package.
  • the signaling pack includes a information representing the identity of the node switching module or element where the signaling packet was generated.
  • the signaling pack includes a information representing the cause of the loss.
  • the information representing the cause of the loss of package makes it possible to distinguish between a loss by congestion, that is to say buffer overflow, and another type of loss.
  • packet routing data signage include the identity of the connection.
  • the monitoring being carried out in a network multi-path switching, packet routing data signaling include an explicit destination exit port address or implicit, the identity of the connection being included in the signaling packet, especially in its data part.
  • the signaling packet has a length equal to that of the lost package.
  • the signaling packet has a length smaller than that of the lost package.
  • the network being of the packet or cell type of fixed length, for example an ATM network, inside a switching node, the length of the signal packet is shorter than the fixed length of the packets or cells transported on external links in the network.
  • monitoring consists in carrying out at least one of the following: monitor the packet loss rate, detect the (or the) module (s) or element (s) causing excess losses, and detecting the cause of excess losses.
  • the packet transport network comprises asynchronous packet switching nodes interconnected by links external carrying packets in asynchronous multiplexing, each node of switching with interconnected input modules and output modules by at least one switching element, each input or output, and each switching element being liable to lose packets, signaling packets can be generated in an input module, a output module, and in a switching element, and signaling packets generated in an input module or a switching element are routed to the output modules, the latter performing monitoring and / or transmitting signaling packets downstream, to other nodes.
  • the monitoring being carried out in a output module of a node, signaling packets are eliminated in such a output module.
  • the first N-1 nodes ensure the transmission of signaling packets downstream to the next node, and the last node provides the monitoring, the losses monitored in this last node comprising, on the one hand, the losses detected upstream of the output module of the last node and indicated in the signaling packets received, and, on the other hand, the losses detected locally in this output module.
  • the signaling packet includes an indicator said original packet loss, which is initialized to a first value, called local origin, when the signaling packet is generated in a module or a switching element where packet loss occurs, and changed to a second value, called external origin, as soon as a signaling packet is transmitted by an output module downstream to another node of the network.
  • the original packet loss indicator in each signaling packet is used to perform, on the one hand, monitoring the overall packet loss rate on several consecutive nodes, and, on the other hand, selective monitoring of the local packet loss rate in each node this series of knots.
  • the signaling packets generated in terminal modules or in switching elements are stored in a specific buffer to store signaling packets, and these signaling packets from the specific buffer are multiplexed with normal packets transmitted.
  • the signaling packets generated in terminal modules or in switching elements are stored in the buffer of this module or switching element at the same time as the data packets.
  • FIG. 1 is a schematic representation of a transport network 10 asynchronous packets (or cells).
  • a transport network 10 asynchronous packets (or cells).
  • Such a network comprises several nodes of switching 12, 14, 16, 18, 20 and 22.
  • Each switching node includes m inputs and n outputs; as we will see below, we refer to a connection to through a node as it forwards packets received on a rank input port i to a rank j output port.
  • each packet of the connection considered is applied at E A to an input of node 12 and is transmitted to an output S C of node 22 by means of node 18.
  • connection considered between the input of node 12 and the output of node 22 constitutes a connection section and, in the example, the packet loss rate is detected between the entry point E A and the exit point S C. In other words, a packet loss rate is measured in node 22 which is accumulated on nodes 12, 18 and 22.
  • FIG 2 there is shown schematically a node 24 with m input ports E 1 ... E m and n output ports S 1 ... S n .
  • terminal modules in such a node each have a single input port and a single output port constituting the interface, with a single external transmission link between nodes.
  • the node is illustrated according to an unfolded representation, that is to say by functionally separating each terminal module into two parts: on one side an "input terminal module” (or “incoming” module) 26 i (with a single “input port”), and on the other side an “output terminal module” (or “outgoing” module) 30 i (with a single “output port”).
  • each physical input or output port can support multiple virtual channels multiplexed on this port which can be used for connections separate individual.
  • the node 24 then comprises at least one switching element 28 p . If several switching elements are provided, these are arranged in one or more stages.
  • a terminal module can include, depending on the switching network architecture considered, one or more links internal. In the latter case, if the node comprises a single switching element, internal links are all connected to this element. When we plan several switching elements (arranged in one or more stages), the each terminal module can be connected either to only one of the elements, or distributed across multiple switching elements. The invention encompasses all of these possibilities and, in general, is independent of the network configuration of switching.
  • each terminal module (input and output) has a single internal link with the network and that the node has a single element of switching.
  • the switching element 28 p m has inputs connected to respective outputs of the modules 26 i and n outputs which are connected to respective inputs of output terminal modules 30 i.
  • An example of a switching element will be described in FIG. 4 and two embodiments of modules 30 i will be described in relation to FIGS. 5 and 6.
  • FIG. 3 represents an exemplary embodiment of an input terminal module 26 i .
  • the packets coming from the input port E i are applied to the input of a device 32 making it possible to separate the data proper from the control information of the packets received. This ordering information can be found in the header of the packages.
  • Block 36 is called "Incoming termination of external packet transport protocol".
  • the output of block 36 is connected to the input of a block 38 called "Preparation of internal package "whose role is, on the one hand, to convert the transport protocol external to the node in a transport protocol internal to the node, and secondly, according to the invention, to detect lost packets.
  • the modifications made to the packet according to the protocol internal to the node appear on an output 38 1 of block 38 and are applied to an input 34 2 of block 34 for temporary storage of packets.
  • the data appearing on the output 38 1 of block 38 include, in particular, routing data inside the node to the destination output port.
  • the lost packet information appears on a second output 38 2 of block 38 and is applied to an input 40 1 of a block 40 whose role is to generate a packet loss signaling packet which is transmitted on an input 34 3 of block 34.
  • the detection of lost packets can be carried out by various known means such as the use of a CRC or parity code found in the packet arriving via the input port E i , or good when removing a packet if there is congestion in the buffer.
  • the packet loss signaling packet generated by block 40 has, in one embodiment, a format analogous to that of a usual package. He understands a header with an indicator characterizing its signaling packet identity packet loss and routing data that is the same as those of the lost package. In the case of multi-path switching, this packet also has a connection identifier. In the case of switching single-path, the connection identifier is part of the routing data of the package.
  • the loss of signaling packets packet are stored in the same buffer memory of block 34 as that provided for normal data packets.
  • a dedicated additional buffer is provided signaling packets and a multiplexer for transmitting alternately normal data packets and signaling packets packet loss (which will later be called “signaling packets").
  • FIG. 4 represents a switching element 28 p .
  • This element 28 p comprises m inputs and n outputs, each input being connected to an output of an input terminal module and each output being connected to an input of an output terminal module (in the example, simplified, d 'only one switching element).
  • the switching element 28 p thus comprises an interconnection matrix 44 with m inputs 46 1 ... 46 m and n outputs 48 1 ... 48 n .
  • Each of the inputs 46 i is connected to a device 50 i whose role is similar to that of the device 32 in FIG. 3, namely that it separates the data proper from the control information found in the header of each package.
  • the actual data is transmitted to the corresponding inputs 46 i of the matrix 44, while the control information, located in the header, is transmitted to a packet routing control block 52.
  • This block 52 which has m inputs, 54 1 to 54 m , uses the routing information, contained in the headers, so as to control the interconnection matrix 44 so that each packet is transmitted to the appropriate output of the node 24. For this, the control signal generated by the block 52 is applied to an input 55 of the matrix 44.
  • a packet detection is carried out, in accordance with the invention. This detection of lost packet is carried out as described above for block 38 of FIG. 3.
  • the information of lost packet is transmitted, by an output 52 1 of block 52 towards the input of a block 56 packet generator signaling.
  • the signaling packets appear on the output of block 56 and are applied to the input 58 of the matrix 44.
  • Block 56 is similar to block 40 of the input terminal module described in relation to FIG. 3.
  • the output terminal module shown in Figure 5 is used when, in the node considered, the signaling packets are used locally, without them transmit downstream to another node on the network.
  • the output terminal module shown in Figure 6 is similar to that shown in Figure 5; but he includes additional means for forwarding signaling packets to the next node.
  • the module 30 i shown in FIG. 5 comprises a buffer memory 60 comprising, in the example considered, an input 62 i connected to the output 48 i of the switching element 28 p (FIG. 4).
  • the input 62 i receives the data of the packet via a device 64 i similar to the device 32 of FIG. 3, that is to say separating, for each packet, the data from the header .
  • the headers are themselves transmitted to a block 66 making it possible, on the one hand, to detect packets for signaling packet loss and, on the other hand, to transmit all of the headers to a preparation block 68 external packet whose role is to convert these headers to a format suitable for transporting packets on external links in the network, according to the external transport protocol used to the next node.
  • Block 68 a means of detecting loss of package.
  • Block 68 generates signaling packets which are transmitted on a input 70 of block 66 for detection of loss.
  • Block 66 has two outputs 72 and 74.
  • the first output 72 delivers information relating to a packet lost locally in the module 30 i and detected by block 68
  • the second output 74 delivers information relating to a lost packet upstream (that is to say outside the terminal module considered) following the reception of a signaling packet.
  • each of these signaling packets also includes a so-called binary indicator of origin of packet loss.
  • the first value called local origin
  • the first value is initialized when the signaling packet is generated in a module, or a switching element, where packet loss occurs (local origin in the node where the loss of package).
  • This first value is modified into a second value, called external origin, as soon as a signaling packet is transmitted by a module output downstream to another node of the network (external origin in a node in upstream of the node considered).
  • This original packet loss indicator does not change no value as long as the signaling packet is circulating in the node where it was created.
  • the outputs 72 and 74 are connected to inputs, respectively 76 1 and 76 2 of a block 76 of packet loss rate observation, while the output 74 is connected to the input of a block 78 of module identification causing an excessive number of losses.
  • the packet loss rate observed on an upstream connection section which may include one or more nodes, depends on both the upstream losses and the local losses in the output terminal module.
  • the module 68 can also transmit the local identification to block 78.
  • the output terminal module 30 ′ i shown in FIG. 6 differs from that shown in FIG. 5 only by the fact that the block 66 has an output 80 which transmits the signaling packets to an input 82 of the buffer memory 60, this module 30 ′ i having the aim of allowing the transmission of signaling packets on the corresponding output of the node to the next node.
  • the first category is surveillance on a connection only within a single switching node.
  • the second category (as shown in Figure 1) is monitoring on a section of connection through several consecutive switching nodes in the network. he It is also possible to combine these two categories of applications.
  • Monitoring limited to a single switching node can have three aspects:
  • the first aspect concerns the location of the module or element causing an excessive number of losses. This identification is done locally in the node.
  • the second aspect relates to the detection of the packet loss rate when transferred through the node.
  • the third aspect is the combination of the first two using the same signaling packets, that is to say that it concerns, in the node considered, both the location of the module or element causing excess losses and the detection of the packet loss rate.
  • the module 30 i shown in FIG. 5 corresponds to this third aspect.
  • block 76 is deactivated; as a variant, a simplified module is provided without such a block 76.
  • the block 78 for identifying the module causing excess losses is deactivated, or a simplified module 30 i is used which does not include this block 78.
  • the last node 22 is of the type corresponding to the first category, that is to say it includes an output terminal module of the type shown in Figure 5 in which signaling packets are dropped.
  • the other nodes, 12 and 18, include an output terminal module of the type shown in the figure 6.
  • the first possibility is to detect only the cumulative rate of packet losses on the connection section formed by nodes 12, 18 and 22.
  • the second possibility concerns - in addition to monitoring the rate of packet losses on section 12, 18 and 22 - the location of modules or elements causing excess loss in at least one node.
  • the third possibility is to perform local detection (in addition to the one on the connection section) of packet loss rates in at least one node, different from the last node 22.
  • the fourth possibility is a combination of the third and fourth possibilities.
  • the fifth possibility consists in locating the module or element causing excess losses in the last node 22 (in addition to the packet loss rate detection on the section).
  • the sixth possibility consists in carrying out a detection rate of loss of packet inside the last node (also in addition to the detection of the rate of packet losses on the section).
  • the seventh possibility is a combination of the fifth and sixth possibilities.
  • connection section comprising several nodes
  • packets of length variable or to fixed length packets.
  • the packets or cells must be transmitted between nodes according to a constant length.
  • origin of loss of packet specifies whether the packet was lost in the node considered (first value, called local origin) or in another node of the network upstream of the node considered (second value, called external origin).
  • this indicator of origin (local or external) of the node where the packet has been lost is also useful for performing simultaneous and selective observation of the packet loss rate inside a node, as well as the cumulative loss rate on a connection section comprising several nodes.
  • block 76 (figure 5) selectively uses the information received from outputs 72 and 74 of the block 66.
  • To determine the packet loss rate only inside the node block 76 uses the information relating to the faulty module which appear on output 72 of block 66, as well as part of the information which appear on output 74 of block 66, namely those that correspond to signaling packets received with a packet loss origin indicator having the value "local origin”.
  • this device 76 uses all the information appearing on outputs 72 and 74 of block 66 to determine the cumulative rate of losses on the connection section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Maintenance And Management Of Digital Transmission (AREA)
EP99402420A 1998-10-29 1999-10-04 Verfahren zur Überwachung des Paketverlustes in einem Kommunikationssystem Expired - Lifetime EP0998164B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9813569 1998-10-29
FR9813569A FR2785480B1 (fr) 1998-10-29 1998-10-29 Procede et dispositif de surveillance de pertes de paquets dans un systeme de communication

Publications (2)

Publication Number Publication Date
EP0998164A1 true EP0998164A1 (de) 2000-05-03
EP0998164B1 EP0998164B1 (de) 2005-12-28

Family

ID=9532129

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402420A Expired - Lifetime EP0998164B1 (de) 1998-10-29 1999-10-04 Verfahren zur Überwachung des Paketverlustes in einem Kommunikationssystem

Country Status (4)

Country Link
EP (1) EP0998164B1 (de)
AT (1) ATE314798T1 (de)
DE (1) DE69929151T2 (de)
FR (1) FR2785480B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1158493A2 (de) * 2000-05-23 2001-11-28 NTT DoCoMo, Inc. Verschleierung von Paket-Verlusten in einer Sprach-über-IP (VOIP) Übertragung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997019535A1 (en) * 1995-11-17 1997-05-29 Telecommunications Techniques Corporation Instrument for test and measurement of atm network virtual connections
US5740173A (en) * 1996-02-28 1998-04-14 Telefonaktiebolaget Lm Ericsson Asynchronous transfer mode (ATM) cell arrival monitoring system
EP0836347A2 (de) * 1996-10-11 1998-04-15 Nec Corporation Hochgeschwindigkeitsübertragung von Fehlerinformationen in einem ATM-Netz

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997019535A1 (en) * 1995-11-17 1997-05-29 Telecommunications Techniques Corporation Instrument for test and measurement of atm network virtual connections
US5740173A (en) * 1996-02-28 1998-04-14 Telefonaktiebolaget Lm Ericsson Asynchronous transfer mode (ATM) cell arrival monitoring system
EP0836347A2 (de) * 1996-10-11 1998-04-15 Nec Corporation Hochgeschwindigkeitsübertragung von Fehlerinformationen in einem ATM-Netz

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHOI Y -H ET AL: "HIERARCHICAL PERFORMANCE MANAGEMENT USING OAM MIB IN ATM NETWORKS", IEEE GLOBAL TELECOMMUNICATIONS CONFERENCE, PHOENIX, ARIZONA, NOV. 3 - 8, 1997, vol. 1, 3 November 1997 (1997-11-03), INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS, pages 175 - 179, XP000737530, ISBN: 0-7803-4199-6 *
MATSUNAGA H ET AL: "VIRTUAL PATH TEST FUNCTION AND ITS MECHANISM FOR ATM TRANSPORT NETWORKS", ELECTRONICS & COMMUNICATIONS IN JAPAN, PART I - COMMUNICATIONS, vol. 77, no. 9, 1 September 1994 (1994-09-01), pages 15 - 29, XP000485730, ISSN: 8756-6621 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1158493A2 (de) * 2000-05-23 2001-11-28 NTT DoCoMo, Inc. Verschleierung von Paket-Verlusten in einer Sprach-über-IP (VOIP) Übertragung
EP1158493A3 (de) * 2000-05-23 2002-11-13 NTT DoCoMo, Inc. Verschleierung von Paket-Verlusten in einer Sprach-über-IP (VOIP) Übertragung
US7127399B2 (en) 2000-05-23 2006-10-24 Ntt Docomo, Inc. Voice processing method and voice processing device

Also Published As

Publication number Publication date
DE69929151T2 (de) 2006-08-31
DE69929151D1 (de) 2006-02-02
ATE314798T1 (de) 2006-01-15
FR2785480A1 (fr) 2000-05-05
EP0998164B1 (de) 2005-12-28
FR2785480B1 (fr) 2002-04-26

Similar Documents

Publication Publication Date Title
EP1155531B1 (de) System und verfahren zur messung der übertragungsdauer und der verluste in einem hochleistungs-telekommunikationsnetz
EP1743454B1 (de) Leistungsmessung in einem paketübertragungsnetz
EP0354120B1 (de) Asynchrones Datenübertragungsverfahren und Vorrichtung mit Verwendung von Mikrozellen
EP1376986B1 (de) Methode zur Rekonstruktion paketisierter Nachrichten, die über ein oder mehrere Netzwerke verschickt wurden
FR3065302B1 (fr) Procede de generation et de controle de trafic de test, port d'entree ou de sortie de commutateur et commutateur associes
EP1743452A1 (de) Leistungsmessung in einem paketübertragungsnetz
WO1998059521A1 (en) Next hop loopback
EP1604487B1 (de) Verfahren zur bandbreitenabschätzung in einer digitalen verbindung
FR2851707A1 (fr) Sonde de mesure de parametres de qualite de service pour un reseau de telecommunication
FR2893471A1 (fr) Systeme et procede de routage statique de flux de paquets de donnees dans un reseau d'interconnexion
WO2004056049A1 (fr) Reseau ethernet en double anneau
EP0998164B1 (de) Verfahren zur Überwachung des Paketverlustes in einem Kommunikationssystem
EP0750442B1 (de) Methode und System für die integrale Vermittlung von leitungsvermitteltem und paketvermitteltem Verkehr
EP1743441B1 (de) Verfahren und system zum schutz eines kommunikationsnetzes, das ein transportnetz umfasst
EP3122005B1 (de) Routing-system, das eine datenfilterung zur integration und überprüfung der betriebsausrüstungen ermöglicht
FR2691029A1 (fr) Procédé d'analyse à distance de données d'un protocole, terminal d'abonné spécialisé et dispositif d'analyse distant correspondant.
EP0752777A1 (de) ATM-Koppelfeld
WO2023111064A1 (fr) Reseau de communication avionique
EP2119140A2 (de) Verfahren zur weiterleitung eines datenpakets durch einen router in einem durch ein transportnetzwerk gestützten paketnetzwerk
EP2273727A1 (de) Verfahren, Vorrichtung und Computerprogram für die Ermittlung von Service-Verfügbarkeit in einem Kommunikationsnetz
EP0923830A1 (de) Vermittlungsvorrichtung mit blockierungsfreier struktur für atm zellen
FR2779019A1 (fr) Procede et dispositif d'emission de donnees, procede et dispositif de reception de donnees
FR2802742A1 (fr) Systeme et procede de commutation de donnees
FR2846170A1 (fr) Procede d'optimisation du trafic sur internet.
FR2778295A1 (fr) Procede et dispositif de communication, de transmission et/ou de reception d'information

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 20001103

AKX Designation fees paid

Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

17Q First examination report despatched

Effective date: 20030604

RTI1 Title (correction)

Free format text: METHOD FOR MONITORING PACKET LOSS IN A COMMUNICATION SYSTEM

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051228

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRE;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.SCRIBED TIME-LIMIT

Effective date: 20051228

Ref country code: IE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051228

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051228

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051228

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REF Corresponds to:

Ref document number: 69929151

Country of ref document: DE

Date of ref document: 20060202

Kind code of ref document: P

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20060223

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060328

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060328

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060328

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060408

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060529

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061031

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061031

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061031

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20060929

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: CD

BERE Be: lapsed

Owner name: ALCATEL

Effective date: 20061031

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20061004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20061031

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20131114 AND 20131120

REG Reference to a national code

Ref country code: FR

Ref legal event code: GC

Effective date: 20140717

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20151022

Year of fee payment: 17

Ref country code: GB

Payment date: 20151021

Year of fee payment: 17

Ref country code: IT

Payment date: 20151028

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20151023

Year of fee payment: 17

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69929151

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20161004

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20170630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161102

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170503

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161004

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161004